Many doctors are claiming that the Trump administration’s new guidelines for birth control cite outdated research to justify exempting certain forms from being covered by insurance.

The administration’s rules are meant to ‘expand exemptions for entities and individuals with objections based on religious and moral convictions.’

Trump’s new rules say the report that the Health Resources and Services Administration (HRSA) used to develop its previous guidelines for covered forms of birth control ‘included several contraceptive methods that many persons and organizations believe are abortifacient—that is, as causing early abortion.’

The Trump administration’s claim is based largely on uncertainty surrounding whether or not these contraceptives can prevent a fertilized egg from being implanted in the uterine lining.

Contraceptives work by stopping ovulation. A number of women’s health experts have said that the most recent research indicates that it’s very unlikely that these contraception methods have the ability to prevent implantation.

The new rules also emphasizes research cited in that report, done by the Institute of Medicine (IOM), that they claim refute the idea that contraceptive use has led to positive public health outcomes and fewer unintended pregnancies.